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I am building an echarts scatter graph that contains 6 points. I would like to manually assign a label to each point, like I did with the label of X and Y axis.
Is there a way to achieve this? I searched in Apache Echarts docs but I did not find any useful setting for assigning a label to "data" values.
Here is the source code of my graph:
option = {
xAxis: {
data: ['Low', 'Med', 'High'],
name: "Value",
},
yAxis: {
min: '5',
name: "Score",
},
series: [
{
type: 'scatter',
symbolSize: 20,
data: [
[2,9.8],
[1,8.8],
[2,5.9],
[1,9.8],
[1,10.0],
[3,9.8],
[2,10.0],
[1,9.8],
[2,5.9],
[1,9.8]
],
label: {
show: true,
position: 'right',
color: "black",
fontSize: 16,
},
}
],
grid:{
show: true,
backgroundColor: new echarts.graphic.LinearGradient(0, 0, 0, 1, [
{
offset: 0,
color: 'rgb(255, 102, 102)'
},
{
offset: 1,
color: 'rgb(153, 255, 153)'
}])
},
};
You could specify the labels as an additional value in the data array:
data: [
[ 2, 9.8, "label1" ],
[ 1, 8.8, "label2" ],
...
Then use a formatter function in your label definition, to select the third element of the data array as the label:
label: {
...
formatter: function(d) {
return d.data[2];
}
I also found this solution, working as well as Chris one:
series: [
{
type: 'scatter',
symbolSize: 15,
data: [
{value: [2,9.8] , name: 'value1'},
{value: [1,8.8] , name: 'value2'},
{value: [2,5.9] , name: 'value3'},
],
label: {
show: true,
position: 'right',
formatter: params => params.name,
color: "black",
fontSize: 16,
},
I'm creating a chart using Echarts and it looks like this on my page:
This causes me two issues, the first is that it's really bad to see the data in the graph, so I need to make the bars bigger.
The second issue is that the bar labels (on the left) are being cut.
My chart config is similar to this, it only has more data in it:
option = {
xAxis: {
},
yAxis: {
data: ["Mon", "Tue", "Wed", "Thu", "Fri", "Sat", "Sun"]
},
series: [{
name: "Sale",
type: "bar",
data: [5, 20, 36, 10, 10, 20, 4]
}]
}
the solution was simple.
After messing around with both the echarts docs and the Laravel Charts that I was using, i managed to get what I wanted by setting a height property at my chart config.
Something like this:
option = {
xAxis: {
},
yAxis: {
data: ["Mon", "Tue", "Wed", "Thu", "Fri", "Sat", "Sun"]
},
series: [{
name: "Sale",
type: "bar",
data: [5, 20, 36, 10, 10, 20, 4]
}],
height: 2000px
}
echarts: bar chart bars are located left and right of the value on the category axis:
How to tell echarts to start the bar with the value on the category axis? Like this:
To clarify the problem, here ist another example. This is a chart of the hourly sum of precipitation. Every bar should show the sum from the bottom to the top of the hour, the data values are conencted to every bottom of the hour.
as you can see, the bars are not starting at 8:00, they are starting at 7:30.
Data: (timestamps are shown in CET)
series: [
{
name: "Niederschlag",
type: "bar",
data: [[1608534000000, 3], [1608537600000, 5], [1608541200000, 2], [1608544800000, 0], [1608548400000, 1] ],
barWidth: '100%'
}
]
It should look like this:
Start point of bar here doesn't matter, you need align labels to left: https://echarts.apache.org/en/option.html#series-bar.label.align
you need a hidden xAxis like below:
option = {
xAxis: [{
type: 'category',
data: [0,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,23],
show: false
}, {
type: 'category',
data: [0,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,23,24],
boundaryGap: false,
axisTick: { alignWithLabel: true },
position: 'bottom'
}],
yAxis: {
type: 'value'
},
series: [{
data: [120, 200, 150, 80, 70, 110, 130,120,210,110,210],
type: 'bar',
barCategoryGap:'20%',
itemStyle: {
},
xAxisIndex: 0,
backgroundStyle: {
color: 'rgba(220, 220, 220, 0.8)'
}
}]
};
You have not provided the complete chart config, so I recommend using this one. Also pay attention on method useUTC and you need to know that "By default, echarts uses local timezone to formate time labels"
So I see this state of Chart by you data with offset -180:
var myChart = echarts.init(document.getElementById('chart'));
var chartData = [
[1608534000000, 3],
[1608537600000, 5],
[1608541200000, 2],
[1608544800000, 0],
[1608548400000, 1],
];
var option = {
tooltip: {},
xAxis: {
type: 'time',
data: ['00:00', '01:00', '02:00', '03:00', '04:00', '05:00', '06:00', '07:00', '08:00', '09:00', '10:00', '11:00', '12:00', '13:00', '14:00', '15:00', '16:00', '17:00', '18:00', '19:00', '20:00', '21:00', '22:00', '23:00'],
splitNumber: 24,
},
yAxis: {
type: 'value'
},
series: [{
name: "Niederschlag",
type: "bar",
data: chartData,
barWidth: '100%',
}],
useUTC: false,
};
myChart.setOption(option);
<script src="https://cdn.jsdelivr.net/npm/echarts#4.9.0/dist/echarts.min.js"></script>
<div id="chart" style="width: 1024px;height:400px;"></div>
I am trying to add a visual map according to the y axis in echarts.
Taking one of their example:
https://echarts.apache.org/examples/en/editor.html?c=area-pieces
The results looks as follow:
what I'm trying to achieve is:
Obviously here, I have just rotated the picture by 90 degree.
How can this be achieve in echarts directly (so not by saving the picture first)?
The simplest solution would be inverting the axis, data index, and visual map axis. See chart options below:
option = {
backgroundColor: '#fff',
xAxis: {
type: 'value',
boundaryGap: [0, '30%'],
position: 'top'
},
yAxis: {
type: 'category',
boundaryGap: false
},
visualMap: {
type: 'piecewise',
show: false,
dimension: 1,
seriesIndex: 0,
pieces: [{
gt: 1,
lt: 3,
color: 'rgba(0, 180, 0, 0.5)'
}, {
gt: 5,
lt: 7,
color: 'rgba(0, 180, 0, 0.5)'
}]
},
series: [
{
type: 'line',
smooth: 0.6,
symbol: 'none',
lineStyle: {
color: 'green',
width: 5
},
markLine: {
symbol: ['none', 'none'],
label: {show: false},
data: [
{yAxis: 1},
{yAxis: 3},
{yAxis: 5},
{yAxis: 7}
]
},
areaStyle: {},
data: [
[200, '2019-10-10'],
[400, '2019-10-11'],
[650, '2019-10-12'],
[500, '2019-10-13'],
[250, '2019-10-14'],
[300, '2019-10-15'],
[450, '2019-10-16'],
[300, '2019-10-17'],
[100, '2019-10-18']
]
}
]
};
Result:
See on Imgur
In the example below the y-axis crosses at 1, rather than 0. Is there a way to achieve this in echarts?
It seems to me, literally, you can't do this with basic bar chart because it will break the coordinate system and result will be anything but not a bar chart.
If you need only visual like on attached picture then you can hide xAxis and draw its surrogate with markLine but you will have the troubles with bar positioning (that will fix with stack and transparent bars, see below).
If you need real chart with responsive, zoomable and other opts then in the Echarts you can use custom series for build own chart type (see example).
Example how to make picture like attached:
var myChart = echarts.init(document.getElementById('main'));
var option = {
tooltip: {},
xAxis: {
data: ['Category-1', 'Category-2', 'Category-3', 'Category-4'],
show: true,
axisLine: {
show: true,
lineStyle: {
opacity: 0
}
},
axisTick: {
show: false,
}
},
yAxis: {
max: 4,
min: -1
},
series: [{
name: 'Series-1',
type: 'bar',
stack: 'group',
data: [1, 1, -3],
color: 'rgba(0,0,0, 0)',
}, {
name: 'Series-2',
type: 'bar',
stack: 'group',
data: [{
value: 1,
itemStyle: {
color: 'red'
}
}, {
value: 2,
itemStyle: {
color: 'green'
}
}, {
value: 1,
itemStyle: {
color: 'orange'
}
}],
markLine: {
symbol: "none",
data: [{
silent: false,
yAxis: 1,
lineStyle: {
color: "#000",
width: 1,
type: "solid"
}
}, ],
label: {
show: false,
}
},
}]
};
myChart.setOption(option);
<script src="https://cdn.jsdelivr.net/npm/echarts#4.8.0/dist/echarts.min.js"></script>
<div id="main" style="width: 600px;height:400px;"></div>
P.S. If this not a secret, why you need it?